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Global functions for NgbOp2dExtra

General structure of the implementation:

• HxFuncNgbOp2dExtraDispatch does the image by calling:
• HxFuncNgbOp2dExtra_Row(variation) does a row of the image by calling:
• HxFuncNgbOp2dExtra_Pix_variation does the neighbourhood of one pixel

Schematically:

HxFuncNgbOp2dExtraDispatch  -->  _Row(P1,Cnum)  -->  _Pix_P1Cnum
                            |
                            |
                            +->  _Row(P1,Loop)  -->  _Pix_P1Loop
                            |                    /
                            +->  _Row(P2,Loop)  -->  _Pix_P2Loop
                            |
                            +->  _Row(PN,Loop)  -->  _Pix_P1Loop

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